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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
What type of protection is galvanising?
  • A
    Physical protection
  • B
    Sacrificial protection
  • ✓
    Physical and sacrificial protection
  • D
    One of the above.
✓

Answer

Correct option: C.
Physical and sacrificial protection
Concept: Galvanizing is the process of applying a protective zinc coating to steel or iron to prevent rusting.
Explanation:
Zinc layer present on iron get oxidised as it is more reactive than iron and forms a layer of zinc oxide on it. As Zinc sacrifice itself to protect iron, it is physical and sacrificial protection.

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